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cyclobutane derivativescyclobutane derivatives Q 0022
-110Sterically-Hindered Halogenocyclobutanones. Part 9. 2-Substituted Methylenecyclopropanes in Reaction with Dichloroketene.-Cyclopropanes like (I) containing an electron donor group in position 2 undergo regiospecific cycloaddition with dichloroketene prepared in situ to afford spirohexanes of type (III) and (IV). Starting from cyclopropanes bearing an electron acceptor group loss of regiospecificity is observed. Reaction of the 2,2-disubstituted cyclopropane (VIII) yields a complex mixture from which only small amounts of the spirohexane (IX) can be isolated. The sterically hindered analogue (X) is converted into the cyclobutene (XI) via rearrangement of the primarily formed spirohexane and the furan derivative (XII). -(BESSMERT-NYKH, A. G.; GRISHIN, YU. K.; DONSKAYA, N. A.; KARPOV, M. V.; KISINA, M. YU.; LUKOVSKII, B. A.; POLONSKII, A. V.; Zh. Org. Khim.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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